package chapter4.Example14;
abstract class Animal{
    abstract void shout();
}
class Cat extends Animal{
    void shout(){
        System.out.println("喵~~喵~~喵~~");
    }
}
class Dog extends Animal{
    void shout(){
        System.out.println("汪汪......");
    }
}
public class Example14 {
    public static void main(String[] args){
        Animal cat = new Cat();
        Animal dog = new Dog();
        cat.shout();
        dog.shout();
    }
}
